// 打印类属性、方法定义
/* eslint-disable */
const Print = function (dom, options, isInit) {
	if (!(this instanceof Print)) return new Print(dom, options);
	this.options = this.extend({
		'noPrint': '.no-print',
		printSize: 'auto',
	}, options);
	if ((typeof dom) === "string") {
		this.dom = document.querySelector(dom);
	} else {
		this.isDOM(dom)
		this.dom = this.isDOM(dom) ? dom : dom.$el;
	}
	if (isInit === undefined || isInit === true) {
		this.init();
	}
};
Print.prototype = {
	/**
	 * 初始化
	 */
	init: function () {
		let content = this.getStyle() + this.getHtml();
		this.writeIframe(content);
	},
	getContent: function () {
		return this.getStyle(true) + this.getHtml();
	},
	getContentWithInit: function (withLink) {
		return this.getStyle(withLink) + this.getHtml();
	},
	/**
	 * 配置属性扩展
	 * @param obj
	 * @param obj2
	 * @returns {*}
	 */
	extend: function (obj, obj2) {
		for (let k in obj2) {
			obj[k] = obj2[k];
		}
		return obj;
	},
	/**
	 * 复制原网页所有的样式
	 * @returns {string}
	 */
	getStyle: function (withLink) {
		let str = "";
		if (withLink) {
			let styles = document.querySelectorAll('style,link');
			for (let i = 0; i < styles.length; i++) {
				str += styles[i].outerHTML;
			}
		}
		str += "<style>" + (this.options.noPrint ? this.options.noPrint : '.no-print') + "{display:none;}</style>";
		// 去除height：100%样式，解决分页下，样式混乱问题
		str += "<style>html,body,div{height: auto;}</style>";
		// 打印布局
		str += `<style type="text/css" media="print">\n @page { size: ${ this.options.printSize }; padding: 0; margin: 0; }\n</style>`
		return str;
	},
	/**
	 * 表单赋值
	 * @returns {string|string}
	 */
	getHtml: function () {
		let inputs = document.querySelectorAll('input');
		let textareas = document.querySelectorAll('textarea');
		let selects = document.querySelectorAll('select');
		for (let k = 0; k < inputs.length; k++) {
			if (inputs[k].type == "checkbox" || inputs[k].type == "radio") {
				if (inputs[k].checked == true) {
					inputs[k].setAttribute('checked', "checked")
				} else {
					inputs[k].removeAttribute('checked')
				}
			} else if (inputs[k].type == "text") {
				inputs[k].setAttribute('value', inputs[k].value)
			} else {
				inputs[k].setAttribute('value', inputs[k].value)
			}
		}
		for (let k2 = 0; k2 < textareas.length; k2++) {
			if (textareas[k2].type == 'textarea') {
				textareas[k2].innerHTML = textareas[k2].value
			}
		}
		for (let k3 = 0; k3 < selects.length; k3++) {
			if (selects[k3].type == 'select-one') {
				let child = selects[k3].children;
				for (let i in child) {
					if (child[i].tagName == 'OPTION') {
						if (child[i].selected == true) {
							child[i].setAttribute('selected', "selected")
						} else {
							child[i].removeAttribute('selected')
						}
					}
				}
			}
		}
		return this.dom.outerHTML;
	},
	/**
	 * 创建iframe
	 * @param content
	 */
	writeIframe: function (content) {
		let w, doc, iframe = document.createElement('iframe'),
			f = document.body.appendChild(iframe);
		iframe.id = "printIframe";
		//iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
		iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;');
		w = f.contentWindow || f.contentDocument;
		doc = f.contentDocument || f.contentWindow.document;
		doc.open();
		doc.write(content);
		doc.close();
		let _this = this;
		iframe.onload = function () {
			_this.toPrint(w);
			setTimeout(function () {
				document.body.removeChild(iframe)
			}, 100)
		}
	},
	/**
	 * 打印
	 * @param frameWindow
	 */
	toPrint: function (frameWindow) {
		try {
			setTimeout(function () {
				frameWindow.focus();
				try {
					if (!frameWindow.document.execCommand('print', false, null)) {
						frameWindow.print();
					}
				} catch (e) {
					frameWindow.print();
				}
				frameWindow.close();
			}, 10);
		} catch (err) {
			console.log('err', err);
		}
	},
	isDOM: (typeof HTMLElement === 'object') ?
		function (obj) {
			return obj instanceof HTMLElement;
		} :
		function (obj) {
			return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string';
		}
};
const PrintPlugin = {}
PrintPlugin.install = function (Vue, options) {
	//添加实例方法
	Vue.prototype.$print = Print
}
export default PrintPlugin;
